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Stockholders' Equity (Details Narrative) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
May 06, 2021
Jan. 31, 2021
Dec. 04, 2020
Dec. 02, 2020
Mar. 31, 2021
Mar. 31, 2020
Jan. 22, 2021
Jan. 21, 2021
Dec. 31, 2020
Dec. 03, 2020
Feb. 28, 2020
Common stock, shares authorized         24,109,635       20,000,000 20,000,000  
Common stock, shares outstanding         24,109,635       21,246,523 19,850,014  
Common stock available for future issuance                   149,986  
Shares over issued         4,109,635            
Common stock, par value         $ 0.001       $ 0.001    
Common stock, shares issued         24,109,635       21,246,523    
Stock-based compensation expense         $ 109 $ 71          
Gross proceeds from warrants exercised         1,406          
Warrants, modification expense         $ 21            
New Warrants [Member]                      
Warrants issued to purchase common stock         1,205,967            
Exercise price of warrants per share         $ 1.04            
Gross proceeds from warrants exercised         $ 1,400            
Warrants, modification expense         1,627            
Employee Options [Member]                      
Non-vested stock options granted, unrecognized estimated compensation cost         $ 197            
Non-vested stock options granted, weighted average period         6 months 18 days            
Employees and Consultants [Member]                      
Number of options, granted         180,000 0          
Fair value options vesting term         3 years 3 years          
Stock-based compensation expense         $ 109 $ 71          
Securities Purchase Agreement [Member]                      
Gross proceeds from private placement       $ 6,000              
Net proceeds from private placement       $ 5,400              
Securities Purchase Agreement [Member] | Private Placement [Member]                      
Sale of stock, number of shares issued       5,914,285              
Sale of stock, price per share       $ 0.70              
Two Investors [Member] | Warrants [Member]                      
Sale of stock, number of shares issued   1,657,144                  
Exercise price of warrants per share   $ 0.001                  
Accredited Investors [Member] | Warrants [Member]                      
Warrants issued to purchase common stock               1,205,968      
Exercise price of warrants per share               $ 1.165      
Subsequent Event [Member]                      
Common stock, shares authorized 24,109,635                    
Shares over issued 4,109,635                    
Common stock, shares issued 4,109,635                    
Common Stock [Member]                      
Shares issued upon conversion     396,509                
Shares over issued     246,523           4,109,635    
Common stock, par value     $ 0.001                
Convertible prferred stock shares issued upon conversion                     110,000
Common Stock [Member] | Subsequent Event [Member]                      
Shares issued upon conversion 4,109,635                    
Pre-funded Warrants [Member] | Securities Purchase Agreement [Member]                      
Sale of stock, number of shares issued       2,657,144              
Sale of stock, price per share       $ 0.699              
Exercise price of warrants per share       $ 0.001              
Series C Preferred Stock [Member]                      
Number of shares converted     396,509                
December 2020 Warrants [Member]                      
Warrants issued to purchase common stock             2,657,144        
December 2020 Warrants [Member] | Common Stock [Member]                      
Shares over issued             2,657,144        
Series E Preferred Stock [Member]                      
Preferred stock, conversion description         Each share of Series E Preferred Stock is convertible at any time and from time to time at the option of a holder of Series E Preferred Stock into one share of the Company’s common stock, provided that each holder would be prohibited from converting Series E Preferred Stock into shares of the Company’s common stock if, as a result of such conversion, any such holder, together with its affiliates, would own more than 9.99% of the total number of shares of the Company’s common stock then issued and outstanding. This limitation may be waived with respect to a holder upon such holder’s provision of not less than 61 days’ prior written notice to the Company.            
Common stock conversion basis         In February 2020, a stockholder converted 110,000 shares of Series E Preferred Stock into 110,000 shares of common stock at a conversion rate of 1 to 1.